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Comparative Psychology is a sub-discipline of psychology and ethology of biology By Gary Greenberg, PhD (To appear in the forthcoming Encyclopedia of the Sciences of Learning, Springer) Comparative Psychology and Ethology are both sciences which study animal behavior, typically non-human behavior, though both have often studied humans. Comparative Psychology is a sub-discipline of psychology and ethology of biology. Both can trace their roots to the late 19th century.
Comparative anatomy involves comparing the body structures of two species. Comparative means to look at the similarities between two things, and anatomy has to do with the structure of the body. Scientists can look at anatomical structures of seemingly unrelated animals to tell how related they are.